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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa8210fd9d3a61c13a812bfc1f6ba513ede0ebface5349216db14bad28188e5' 
  AND token = '9DmYIr9T+2vSHVSJdLz2sU67UL4TRkQ9/u/WighQQlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}